ORA-27101 Shared memory realm does not exist

1.sqlplus user/password

在试图启动或连接数据库的时候 ,Oracle报告下列错误：
ERROR:
ORA-27101 Shared memory realm does not exist
ORA-01034 ORACLE not available

2.sqlplus /nolog

3.SQL> conn /as sysdba
ERROR:
ORA-28056: Writing audit records to Windows Event Log failed
OSD-1627319533: Message 1627319533 not found; product=RDBMS; facility=SOSD
O/S-Error: (OS 1502) ??????????????????

4.打开windows 事件查看器(win+R->eventvwr)，将应用程序日志清理一下，重新连接数据库，连接成功。

5.SQL> conn /as sysdba

6.startup

参考：

http://kylinsoong.iteye.com/blog/776654

http://aquariusm.iteye.com/blog/734434